-tachi aliases

kanojo_tachi_no_ryuugi -> kanojo-tachi_no_ryuugi
oretachi_ni_tsubasa_wa_nai -> ore-tachi_ni_tsubasa_wa_nai
ano_hi_mita_hana_no_namae_wo_bokutachi_wa_mada_shiranai -> ano_hi_mita_hana_no_namae_wo_boku-tachi_wa_mada_shiranai
renkyuu_no_kanojotachi -> renkyuu_no_kanojo-tachi
ashiarai-yashiki_no_juunintachi -> ashiarai-yashiki_no_juunin-tachi
wakeari_no_koibitotachi -> wakeari_no_koibito-tachi (I already moved the posts but since there is already an alias from wakeari_no_koibito_tachi it needs moving).

For consistency with the standard established in forum #52866.

I tend not to hyphenate tachi and I'm not sure we really have a policy on it. That thread was just one reply on the issue.

I don't really care either way, but I slightly prefer the status quo and aliasing to hyphens just seems unnecessary. The first one can be aliased to "kanojotachi" for consistency.